30 results about "Compacted graphite iron" patented technology

The present invention relates to a coated cemented carbide milling insert for either wet or dry machining of cast iron such as nodular cast iron (NCI), grey cast iron (GCI), austempered ductile iron (ADI) and compacted graphite iron (CGI) where a high wear resistance and an excellent resistance against thermo cracks are required comprising: a substrate comprising from about 5 to about 7 wt-% Co, from about 140 to about 250 ppm Ti+Ta and balance WC with a weight ratio Ti / Ta of from about 0.8 to about 1.3 and a PVD-layer consisting of AlxTi1-xN, with x=from about 0.50 to about 0.70 and with a thickness of from about 1 to about 10 μm. The invention also relates to a method for making cutting tool inserts and their use.

A compacted graphite iron having composition comprising: Fe as a major ingredient, C: of about 3.4˜4.2 wt %, Si: of about 1.5˜2.5 wt %, P: 0.10 wt % or less (not including 0), S: of about 0.10 wt % or less (not including 0), Cr: of about 0.10 wt % or less (not including 0), Mn: of about 0.1˜0.6 wt %, Cu: of about 0.2˜1.6 wt %, Sn: of about 0.1 wt % or less (not including 0), Mg: of about 0.05 wt % or less (not including 0), Mo: of about 0.05˜0.5 wt %, at least one ingredient of V: of about 0.05˜0.5 wt % and Ti: of about 0.05˜0.5 wt %, and other inevitable impurities; an engine cylinder head; and a vehicle.

The present invention discloses coated cemented carbide milling inserts, particularly useful for rough and semifinishing milling of grey cast iron, highly alloyed grey cast iron, compacted graphite iron (CGI) with or without cast skin under dry conditions. The inserts are characterised by a WC-Co cemented carbide with a low content of cubic carbides and a W-alloyed binder phase and a coating including an inner layer of TIC x N y with columnar grains followed by a wet blasted layer of ±-Al 2 O 3 . on the rake face and coloured top layer on the clearance side. The invention also relates to a method of making cutting tool inserts according to the above.

The present invention relates to cast iron, and more specifically relates to CGI (Compacted Graphite Iron) cast iron in which the amounts of carbon (C), silicon (Si), manganese (Mn), copper (Cu), tin (Sn) and magnesium (Mg) are controlled during production, thereby improving the castability and also giving a stable tensile strength and yield strength and giving an appropriate range of hardness, and also to a production method for the same.

Compositions and methods for reducing toolwear during iron-machining, including applying a composition comprising water; a lubricant ester; and a sulfur-containing lubricant additive.

A process for production of compacted graphite iron using in-mould addition of a magnesium alloy is disclosed. The process is characterised by a step of pre-treating the base iron in a ladle or in a furnace with an alloy containing cerium and performing a structure forming treatment in a reaction chamber in the mould using an alloy containing magnesium and lanthanum.

A sampling device for thermal analysis of solidifying metal, particularly compacted graphite iron is disclosed, comprises a container (2) essentially cylindrical, open at the top intended to be immersed down into and filled with a liquid metal to be analyzed, at least one temperature responsive sensor member (4), preferably two, a protective tubing (14) concentrically enclosing said sensor(s), arranged inside said container (2) and supported by a sensor support member (15) arranged above said container and attached to the container (2) by legs (16) and intended to guide and keep the sensors (4) in position, when immersed in the solidifying metal sample quantity (3) during analysis, said container (2) comprises an interior surface (17) intended to contact the sample quantity (3) during analysis, and an exterior surface (18) intended to contact the ambient atmosphere, said surfaces (17 and 18) being joined at the mouth (12) of the container (2), being equally spaced forming a closed insulating space (8), wherein said container (2) has a substantially semi-spherical bottom part (2b), having a concentrically arranged flattened part (2c).

The present invention pertains to a non-magnesium process to produce Compacted Graphite Iron (CGI) by placing a treatment alloy into a treatment ladle, and then placing an inoculant over die treatment alloy in the treatment ladle and pouring a molten base metal there over. The treatment alloy comprises iron, silicon and, lanthanum, wherein lanthanum is 3-30% by weight of the treatment alloy, silicon is 40-50% by weight of the treatment alloy, and the remaining is Iron. Lanthanum in the treatment alloy makes the graphite precipitate as vermiculite (compacted form) instead of flake or spheroids. With extended process window offered by this new process (0.03-0.1% residual lanthanum in the metal) required to make CGI, this new process removes the stringent process control (0.01-0.02% residual magnesium in the metal) dictated by the magnesium process of making CGI.

Coated milling insert has a WC-Co cemented carbide with a low content of cubic carbides and a highly W-alloyed binder phase and a coating including an inner layer of TiCxNy with columnar grains followed by a layer of κ-Al2O3 and a top layer of TiN. The coated milling insert is particularly useful for milling of grey cast iron with or without cast skin under wet conditions at low and moderate cutting speeds and milling of nodular cast iron and compacted graphite iron with or without cast skin under wet conditions at moderate cutting speeds.

Coated milling insert has a WC—Co cemented carbide with a low content of cubic carbides and a highly W-alloyed binder phase and a coating including an inner layer of TiCxNy with columnar grains followed by a layer of κ-Al2O3 and a top layer of TiN. The coated milling insert is particularly useful for milling of grey cast iron with or without cast skin under wet conditions at low and moderate cutting speeds and milling of nodular cast iron and compacted graphite iron with or without cast skin under wet conditions at moderate cutting speeds.

The invention relates to a production method of vermicular graphite cast iron, in particular to a method for improving the vermicular rate of vermicular graphite cast iron by using a pulsed electromagnetic field. First, add vermative agent and inoculant to the molten iron, perform vermicular treatment at a temperature of 1420-1450°C, and then pour the treated molten iron into the experimental mold, the main point of which is to apply intermittent commutation to the pouring mold Traveling wave magnetic field, the power frequency is 50 Hz, and the magnetic induction is 0.01-0.03T. Finally, vermicular graphite cast iron with a creep rate of more than 75% can be obtained, and the residual content of magnesium and rare earth can reach Mg respectively. 残 =0.01~0.05%, Re 残 = 0.01 to 0.03%. The technical breakthrough of the invention opens up a new way for the production of vermicular graphite cast iron.

The present invention discloses coated inserts particularly useful for milling of compacted graphite iron under wet conditions at moderate cutting speeds comprising a cemented carbide body and a coating. The cemented carbide body comprises WC, from about 7.3 to about 7.9 wt-% Co and from about 1.0 to about 1.8 wt-% cubic carbides of Ta and Nb and a highly W-alloyed binder phase. The radius of the uncoated cutting edge is from about 25 to about 45 μm.The coating comprises:a first, less than about 1 μm, TiCxNyOz layer adjacent to the cemented carbide having a composition of x+y=1, x is greater than or equal to 0;a second, from about 1 to about 2 μm, TiCxNyOz layer having a composition of x greater than about 0.4, y greater than about 0.4 and z is less than about 0.1 and equal to or greater than zero;a third, less than about 1 μm, TiCxNyOz layer having a composition of x+y+z greater than or equal to about 1 and z greater than about 0;an α-Al2O3-layer with a thickness of from about 2.1 to about 3.3 μm; anda further from about 0.1 to about 2.5 μm, thick layer of TiN missing along the edge line.

A method of analysing an iron melt for producing compacted graphite iron includes receiving thermal data from cooling of a cast melt including a predetermined amount of carbon, magnesium, balance iron and unavoidable impurities, plotting the temperature of the cast melt against time such that a plotted time-temperature curve is generated, comparing the generated plotted curve to at least one reference curve, the reference curve representing a corresponding thermal analysis of another melt, the resulting nodularity of which is known, for the purpose of predicting the nodularity of the cast melt on basis of the difference between the curves. The comparison on which the nodularity is predicted is performed along each of the curves for a time interval t1-t2 corresponding to a temperature interval T1-T2, where T1 is in the range of TEstart-TEmim where TEstart is the temperature of beginning formation of graphite in the melt and TEmin is a minimum temperature before start of eutectic recalescence in the melt, and T2 is in the range of Tsolidus-(Tsolidus-20° C.), and other time intervals in the curves are excluded from the comparison

Method for determining the cuttability of a compact graphite iron, characterised by the steps of: - arriving at a relationship between cuttability and contents of carbide-stabilising substances in compact graphite iron, which relationship is arrived at empirically from measured cuttability and measured contents of carbide-stabilising substances in a plurality of test pieces of compact graphite iron; - providing a compact graphite iron; - determining the contents of carbide-stabilising substances in the compact graphite iron provided; - determining a value for the cuttability of the compact graphite iron provided on the basis of the relationship and contents of carbide-stabilising substances in the compact graphite iron provided.

Provided is a production process of forced air cooling whole-sorbite type vermicular graphite cast iron. Vermicular graphite cast iron workpieces are contained in a stainless steel protecting box, thestainless steel protecting box is filed with particulate charcoal, and then the stainless steel protecting box is placed into a box type electric furnace heated to be 900 DEG C, and is subjected to constant temperature for 2 hours under the set austenitizing temperature; the vermicular graphite cast iron workpiece subjected to diathermanous treatment for regulated time are fast taken out of the protecting box in the box type furnace, and sequentially hung on a hanging frame in front of the furnace; two draught fans are started to be aligned with the direction of the vermicular graphite cast iron workpieces for opposite blowing, and the cooling speed of vermicular graphite cast iron test rods is controlled to be larger than or equal to 100 DEG C / min; and when the temperature of the vermicular graphite cast iron workpieces subjected to air cooling is 490-500 DEG C, air blowing stops, and after air cooling continues to be performed till room temperature is achieved, and the whole-sorbitetype vermicular graphite cast iron workpieces are obtained. The production process of the forced air cooling whole-sorbite type vermicular graphite cast iron has the beneficial effect of being simplein process, after high-temperature heating forced air cooling heat treatment, a novel vermicular graphite cast iron material with higher mechanical performance is obtained, and the strength, hardnessand the abrasion resistance indexes of the novel vermicular graphite cast iron material should approach or reach more than two times those of the common as-cast vermicular iron.

The present invention discloses coated milling inserts particularly useful for milling of compacted graphite iron under wet conditions at moderate cutting speeds comprising a cemented carbide body and a coating. The cemented carbide body comprises WC, 7.3-7.9 wt-% Co and 1.0-1.8 wt-% cubic carbides of Ta and Nb and a highly W-alloyed binder phase. The radius of the uncoated cutting edge is 25-45 µm. The coating comprises - a first <1 µm TiC x N y O z layer adjacent to the cemented carbide having a composition of x+y=1, x>= 0, - a second 1-2 µm TiC x N y O z layer having a composition of x>0.4, y>0.4 and 0=<z<0.1 - a third <1 µm TiC x N y O z layer having a composition of x+y+z>=1 and z>0 - an ±-Al 2 O 3 -layer with a thickness of 2.1-3.3 µm and - a further 0.1-2.5 µm, thick layer of TiN missing along the edge line.

The invention relates to an automobile brake disc and a manufacturing method thereof. The appearance of the automobile brake disc is same with that of the brake disc in the prior art. The automobile brake disc is characterized in that the rotating direction of a fin in the brake disc is in spiral torsion from the center to the edge, and the spiral torsion is of an Achimedean spiral structure. Thematerial of the automobile brake disc is compacted graphite iron, and the outer surface of the brake disc is subjected to boronizing treatment.

A method of analyzing an iron melt for producing compacted graphite iron includes receiving thermal data from cooling of a cast melt including a predetermined amount of carbon, magnesium, balance iron and unavoidable impurities, plotting the temperature of the cast melt against time such that a plotted time-temperature curve is generated, comparing the generated plotted curve to at least one reference curve, the reference curve representing a corresponding thermal analysis of another melt, the resulting nodularity of which is known, for the purpose of predicting the nodularity of the cast melt on basis of the difference between the curves. The comparison on which the nodularity is predicted is performed along each of the curves for a time interval t1−t2 corresponding to a temperature interval T1−T2, where T1 is in the range of TEstart−TEmin where TEstart is the temperature of beginning formation of graphite in the melt and TEmin is a minimum temperature before start of eutectic recalescence in the melt, and T2 is in the range of Tsolidus−(Tsolidus−20° C.), and other time intervals in the curves are excluded from the comparison.

The invention discloses a low-tin-silicon-molybdenum vermicular graphite cast iron. The low-tin-silicon-molybdenum vermicular graphite cast iron consists of the following components by weight percentage: 3.4-3.8% of carbon, 2.1-2.6% of silicon, and 0.1-2.6% of molybdenum 0.3%, manganese 0.2‑0.3%, niobium 0.2‑0.3%, chromium 0.1‑0.2%, tin 0.01‑0.03%, antimony 0.01‑028%, vanadium 0.1‑0.18%, titanium 0.15‑0.25 %, the total content of phosphorus and sulfur does not exceed 0.06%, and the balance is iron and its unavoidable impurities. The low-tin-silicon-molybdenum vermicular graphite cast iron of the present invention has a small whiting tendency and a small length-thickness ratio of the vermicular graphite, so that the low-tin-silicon-molybdenum vermicular graphite cast iron has excellent strength, wear resistance and thermal fatigue resistance. At the same time, the present invention also provides a method for preparing the above-mentioned low-tin-silicon-molybdenum vermicular graphite cast iron, so that the obtained low-tin-silicon-molybdenum vermicular graphite cast iron has high creep rate, good comprehensive performance, simple process operation, and is suitable for large-scale industrial production.